http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Yayi Cheng,Jianfeng Huang,Liyun Cao,Yongfeng Wang,Ying Ma,Shaohua Xi,Bingyao Shi,Hui Xie,Jiayin Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.15 No.01
SnSe2 and SnSe nanocrystals were prepared using a simple solvothermal method by changing the molar ratio of SnCl2 · 2H2O and Se powder. When SnSe2 and SnSe are acted as lithium ion battery anodes, the SnSe hybrid structure shows more excellent electrochemical performance than that of SnSe2 interconnected nanosheet. It delivers a reversible capacity of 1023 mA h g -1 at a current density of 200 mA g -1, and maintaining a capacity of 498 mA h g -1 till 120 cycles. According to many present works, SnSe2 with interconnected thin nanosheet should possess more superior property than hybrid structured SnSe due to short charge transfer paths. However, in our research, the result is the opposite. Therefore, we consider that the superior electrochemical performance of SnSe is attributed to its highly reversible conversion reaction mechanism than SnSe2.
Ma, Peng-Cheng,Liu, Ming-Yang,Zhang, Hao,Wang, Sheng-Qi,Wang, Rui,Wang, Kai,Wong, Yiu-Kei,Tang, Ben-Zhong,Hong, Soon-Hyung,Paik, Kyung-Wook,Kim, Jang-Kyo American Chemical Society 2009 ACS APPLIED MATERIALS & INTERFACES Vol.1 No.5
<P>Nanocomposites reinforced with hybrid fillers of carbon nanotubes (CNTs) and carbon black (CB) are developed, aiming at enhancing the electrical conductivity of composites with balanced mechanical properties while lowering the cost of the final product. Epoxy-based nanocomposites were prepared with varying combinations of CNTs and CB as conducting fillers, and their electrical and mechanical properties were evaluated. It was shown that the addition of CNTs in CB composites enhanced the electrical conductivity of composites: a low percolation threshold was achieved with 0.2 wt % CNTs and 0.2 wt % CB particles. The CB particles also enhanced the ductility and fracture toughness of nanocomposites, confirming the synergistic effect of CB as a multifunctional filler. The novelty of this work lies in the synergy arising from the combination of two conducting fillers with unique geometric shapes and aspect ratios as well as different dispersion characteristics, which have not been specifically considered previously.</P>
Analytical methodology for solving anisotropic materials of antiplane problems
Ma, Chien-Ching,Cheng, Yih-Hong Techno-Press 1999 Structural Engineering and Mechanics, An Int'l Jou Vol.7 No.2
An analytical methodology for solving antiplane problem of anisotropic materials is proposed and discussed in detail in this study. The material considered in this study possesses a symmetry plane at z=0. The relationship between the problems of anisotropic materials and the corresponding isotropic problems are established by Ma (1996) on the basis of the general solutions for the shear stresses and displacement in both the polar and Cartesian coordinate systems. This implies that any solution of an anisotropic problem can be obtained by solving a corresponding isotropic problem. In this study some examples and numerical results are presented as an explanation of how the complicated anisotropic problem could be solved by the associated simpler isotropic problem.
( Cheng Wei Ma ),( Le Zhang ),( Jian Ying Dai ),( Zhi Long Xiu ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.12
During the fermentative production of 1,3-propanediol under high substrate concentrations, accumulation of intracellular 3-hydroxypropionaldehyde will cause premature cessation of cell growth and glycerol consumption. Discovery of oxidoreductases that can convert 3- hydroxypropionaldehyde to 1,3-propanediol using NADPH as cofactor could serve as a solution to this problem. In this paper, the yqhD gene from Klebsiella pneumoniae DSM2026, which was found encoding an aldehyde reductase (KpAR), was cloned and characterized. KpAR showed broad substrate specificity under physiological direction, whereas no catalytic activity was detected in the oxidation direction, and both NADPH and NADH can be utilized as cofactors. The cofactor binding mechanism was then investigated employing homology modeling and molecular dynamics simulations. Hydrogen-bond analysis showed that the hydrogen-bond interactions between KpAR and NADPH are much stronger than that for NADH. Free-energy decomposition dedicated that residues Gly37 to Val41 contribute most to the cofactor preference through polar interactions. In conclusion, this work provides a novel aldehyde reductase that has potential applications in the development of novel genetically engineered strains in the 1,3-propanediol industry, and gives a better understanding of the mechanisms involved in cofactor binding.
The Historical Heritage of Chinese Koreans
Ma, Qui-Cheng 在外韓人學會 1993 在外韓人硏究 Vol.3 No.1
The ancestors of the Chinese Koreans were immigrants from the neighbouring Korean Peninsula. In twos and threes they entered what is today's East Liaoning Province as early as the 17th century. The exodus reached its climax after the mid-19th century, when famine, war, feudal despotism and, in particular, the invasion by the Japanese imperialists, forced the Koreans to cross the river en masse and settle down in the frontier areas of the three northeast Chinese provinces of Liaoning, Jilin and Heilongjiang.
cDNA Cloning and Expression Analysis of a Novel Human F-Box Only Protein
Haipeng Cheng,Yushu Ma,Xiaohua Ni,Min Jiang,Lingchen Guo,Wei Jin,Weiwen Xu,Gentao Cao,Chaoneng Ji,Kang Ying,Shaohua Gu,Yuhong Ma,Yi Xie,Yumun Mao 한국분자세포생물학회 2002 Molecules and cells Vol.14 No.1
F-box proteins are an expanding family of eukaryotic proteins that are characterized by an approximately 40 amino acid motif. Some F-box proteins are critical for the controlled degradation of cellular regulatory proteins. During a large-scale sequencing analysis of a human fetal brain cDNA library, we isolated a cDNA clone that encodes a novel F-box protein. It showed a 90.0% identity with the previously isolated mouse F-box protein16 at the amino acid level. Northern blot analysis showed no detectable expression, while re-verse transcription-polymerase chain reaction analysis indicated that FBXO16 was expressed in the heart, spleen, and colon. By mapping, we localized the FBXO16 gene to the human chromosome 8p12. The FBXO16 gene consisted of 9 exons that spanned 67,816 bp of human genomic DNA.
Qiuling Ma,Huixuan Zhang,Yuqi Cui,Xiaoyong Deng,Ruonan Guo,Xiuwen Cheng,Mingzheng Xie,Qingfeng Cheng 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
Cu2O decorated TiO2 nano-tube arrays (Cu2O/TiO2 NTAs) photoelectrode was fabricated throughelectrodeposition strategy. Meanwhile, physicochemical properties of the resulting photoelectrode weresystematically studied by series of measurements. Results indicated that Cu2O/TiO2 NTAs photoelectrodeperformed a significantly enhanced light absorbance in the visible region between 400 and 800 nm,transient photocurrent density of 0.162 mA Cm 2, photogenerated charge separation efficiency and 99.9%of photoelectrocatalytic efficiency for decomposition of 2,4,6-trichlorophenol within 120 min Xenonillumination with the help of +1.0 V (vs. SCE) potential. Furthermore, the enhanced visible lightresponsible photoelectrocatalytic mechanism was proposed and discussed.
Qiming Cheng,Xinqiao Ma,Yinman Cheng 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.5
In order to solve the problem of excessive damage to doubly fed induction generator (DFIG) system under the condition of unbalanced voltage, this paper presents an improved coordinated control strategy based on doubly-fed induction generator (DFIG) wind power system, which can solve these problems well. The innovation of this paper is that the parallel grid-side converter (PGSC) uses a passivity-based controller (PBC) based on the Port Control Hamiltonian Dissipation (PCHD) model. Not only can four diff erent control goals be achieved, namely, constant voltage of DC bus voltage, grid-side active power without second harmonics, grid-side reactive power without second harmonics, and grid-side current without negative sequence component, but also to ensure that the balance of stator and rotor current without distortion, the DFIG output power and electromagnetic torque without pulsation. The proposed coordinated control strategy has the characteristics of not changing the control strategy of the rotor-side converter and avoiding complex high-order matrix. The experimental results on the software platform and the hardware platform show that the proposed coordinated control strategy has the advantages of fast response, strong anti-interference ability, high stability, less control parameters.
Automatic Image Segmentation with PCNN Algorithm Based on Grayscale Correlation
Hai-Rong Ma,Xin-Wen Cheng 보안공학연구지원센터 2014 International Journal of Signal Processing, Image Vol.7 No.5
In order to use pulse coupled neural networks (PCNN) for precise automatic image segmentation, we propose an improved PCNN model. We first establish a connection weight matrix based on the image local gray correlation and on the Euclid distance. We then used the minimum variance ratio criterion to automatically determine PCNN cycle times, and achieve automatic image segmentation. The simulation results show that this method can automatically determine the number of iterations PCNN, and that it is highly feasible and better segmentation effect.
Yuqi Cui,Qi Meng,Xiaoyong Deng,Qiuling Ma,Huixuan Zhang,Xiaoli Li,Mingzheng Xie,Qingfeng Cheng,Xiuwen Cheng 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.43 No.-
In this study, Pt NCs/TiO2 NTAs photoelectrode was fabricated through anodization process, followed byrecycle pulse electrodeposition strategy. Subsequently, physicochemical properties of the resultingsamples were studied systematically. Results indicated that Pt NCs/TiO2 NTAs photoelectrode exhibitedintense light absorbance both in the UV and visible region, high transient photocurrent density of0.089 mA cm 2 and open circuit potential of 0.275 V cm 2. In addition, 98.3% of aspirin could beeliminated within 4 h Xenon illumination with the help of +0.4 V potential. Furthermore, it can beconcluded that two tentative pathways for PEC degradation of aspirin were proposed and confirmed.